Stopping device for looms



Jan. 19 1926.

P. RENARD El AL STOPPING DEVICE FOR LOOMS Filed July 2. 1920 Patented Jan. 19, 1926.

UNITED -s'rarlszs.

1,570,283 PATENT OFFICE;

PIERRE RENARD AND ALBERT RENAED, OF NONANCOURT, FRANCE.

STOPPING DEVICE FOR LOOMS.

' Application filed July 2, 1920. Serial No. 393,766.

(GRANTED UNDER THE PROVISIONS or me Ac'r or manor! 3; 1921, 41 STAT. I.., 1313.

March 9, 1917, No. 104,692; and in Spain,

January 21, 1920), and ofwhich the following is a specification.

As set forth in United States Patent No. 894,287 dated July 28, 1908, for power loom for the manufacture of tufted pile fabrics, and'in United States Patent No. 969,565, dated September 6, 1910, for loom for weaving oriental and other knot-stitch carpets, the formation of the knot of the oriental carpet on this loom depends upon a dis tributor'an'd a knotting apparatus.

Under the action of jacquard patterns, that is according to adesign to be reproduced, the pile thread of the bobbins of suitable color is brought by the distributor to the point of distribution whence it is drawn by a distributing gripper whose length cor responds to the height of the pile. The knotting apparatus seizes this portion of drawn thread, and the latter is out 01f at thedistributing point by a knife, the pile thread then being knotted upon the warp in the known manner by knotting mechanism.

If a resistance at the bobbin should cause the pile thread to escape,ifthe thread breaks, or should a bobbin become empty without being replaced, the knotting. tool will not be supplied and the knot cannot be formed at this point. If owing to any cause, the knotting tool fails to hold the ends of the pile thread which is distributed and cut, the latter will escape and cannot be knotted upon the Warp threads.

Faults of this character are difficult and expensive to repair after manufacture, for loom-made carpets usually have a thick and close texture, so that the insertion of the missing knots by hand and with the needle cannot well be carried out.

For this reason, in order to manufacture carpets of perfect quality and to obviate cost of repairs, we have provided means for automatically stopping theloom every. time that a knot is not formed for any reason,

and as above stated, this fault can only occur in the distributer or the knotting" ap- 'paratus.

The present lnvention therefore,-relates to looms for producing. bv mechanical. means, oriental or other knotted carpets, and consists in the adoption of an indicating device upon the knottin-g apparatus for stopping the loom automatically when the knot has'not been formed. Said device is combined upon the loom with an optical signal, indieating to the loom operator that a knot is vices as there are knotting apparatus, each device being quite independent from the adjacent indicating devices and actin separately upon its own knotter. 1

In the accompanying drawings: V Figure 1 is atop plan View of thedevice embodying the invention;

2 is a side View of Fig. 1; Fig 3 is'a plan viewshowing the parts in different position'from that shown in Fig. 1;

Fig. 4 is a side view of- Fig. 3 and in addition the device;

Fig. 5 is a section on line 55 of Fig. 4

showing in front View the lever controlling device lever controlling uncoupling Figs. 1 and 3, show part of a knotting 1;;

apparatus analogous to that described in U. S. Patent No. 894,287 wherein if the pile'thread is lacking for the making of the knot the parts retain the position shown in Fig. 1, until they take back-their normal position; It is this momentary situation that affords the basis for the present in vention.

A small carriage 24, one for each knotter,

is mounted to slide in front of the batten in a horizontal frame 23 which is displaceable with respect to the batten. In Fig. 1 the carriage 24 and itslink 25 are inthe position for tying the knot and in Fig. 3 the parts are in the position which they have after the automatic tying of the knot;

To the carriage 24 is attached a rod 26 which extends lengthwise beyond the crank 33 and can extend through and beyond a hole bored in the horizontal bar or end member 28 of the frame 23. The end of the rod 26 which protrudes through the frame member 28 extends a short distance through a slot 34 in a plate 29.

This plate is guided along the end member 28 bv screws 28 suitably spaced apart and engaging in slots 29 in the plate.

At one end the plate 29 carries a second plate 39 which comprises a vertical guide way 35. This plate 39 has a laterally projecting pin 40 which is engaged by a rotary cam 40 and connected with a return spring device so as to impart to the plate 29 a reciprocating movement. The cam 40 is mounted on a shaft 40 conveniently con.- neeted to the main cam shaft actuating all of the devices, such as the knotters, grippers, &c. I

When the rod 26 is in the released position, Fig. 3 its end 27 is Withdrawn into the member 28 so that the plate 29 can rec1procate freely, but if on theother hand the rod is in the blocked position, Fi g. 1, the end 27 engaged in the slot 34 limits to the length of this latter the return stroke of the late 29 which stroke is normally longer.

It is this limitation which determines the uncoupling that stops the loom.

Since the knotting apparatus has a double reciprocating.movement, one in the vertical direction and the other in the direction of the warp, in order that whatever should be the position of the knotting apparatus the action of the plate 29 may be transmitted to the lever determining the uncoupling of the loom, a particular arrangement (Figs. 4 and 5) of this lever and of the guide-way 35 which controls it, is adopted.

To allow of the movement in the direction of the Warp the uncoupling lever hasthe form of a stirrup 36 of suitable dimensions fixed to an axle 37 which rocks in bearings 42 conveniently actuated by cams 43 on a shaft 44 connected to the main cam shaft. Springs 45 urge bearings 42 against the cams 43-. At the middle of the axle is mounted an arm 38 wheret0 is pivoted a rod 41, terminating in the uncoupling device.

The guide-way 35 is of sufficient height to allow of displacements of the stirrup 36, in the vertical direction without disengagement from the guideway.

In consequence of the stoppage of the link 25 occasioned by a breakage of the thread, the rod 26 rests in the position shown in Fig. 4, the plate 29 is stopped upon its return movement while the axis 3'? on which is pivoted the yoke 36 continues to move and causes the stoppage of the machine by means of rod 41.

With the automatic stopping device may be combined an optical signal constituted in the following manner:

To the plate 29 is pivoted, by means of a screw 31, an indicator 30, consisting of a small metal bent lever normally resting against a pin 43.

The plate 29 being at the limit of its stroke to the left, or outward stroke (Fig. 4), if the pin 26 is withdrawn into the frame member 28, (Fig. 3), the plate can perform its stroke to the right, or return stroke, which is of a length greater than that of the slot 34, without operating the indicator, but if, on the contrary, the disconnection is not produced (Fig. 1) the pin projects bringing the indicator in the return stroke or movement to the right and causes the indicator to turn into the position shown in Fig. 2, wherein it rests against a pin 32 and protrudes beyond the bar of the knotting apparatus so as to be visible. At the moment when the indicator comes in contact with the pin 32, the rod 26 encounters the end of the slot 34 and stops the stroke of the plate.

The elastic control, that is to say the return spring, moves the plate in the direction in which its stroke is susceptible of being limited.

We claim 1. A device for'automatic-ally stopping a power loom for the manufacture of oriental and other knotted carpets each time a knot has not been formed, said device comprising a knotting carriage, a rod secured thereto, a plate having a reciprocating motion, a transmission mechanism operable by said plate to uncouple the loom, said rod arranged to engage the plate to limit the movement thereof upon the failure of the knotting mechanism to seize thepile thread.

2. In a device of the character described, a knotting carriage comprising a link, a reciprocating plate, a transmission mechanism operable by said plate to uncouple the loom, a rod secured to the carriage arranged to engage the plate to limit the stroke of the latter, and an indicator operable by the movement of the plate to indicate the position of link of the carriage.

3. In a device of the character described, the combination of a knotting slide, a link connected thereto, a crank connected to the link, an indicator in operative relation with the slide, means to reciprocate the indicator and a rod connected to the slide adapted to be projected by the latter into the path of the indicator upon the failure of the knotting apparatus to seize the pile thread.

In witness whereof, we have hereunto signed our names.

PIERRE RENARD. ALBERT RENAR'D. 

